package org.apache.maven.lifecycle.internal;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import org.apache.maven.execution.MavenSession;
import org.apache.maven.project.MavenProject;
import org.codehaus.plexus.component.annotations.Component;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @since 3.0
 * @author Kristian Rosenvold This class is not part of any public api and can be changed or deleted
 *         without prior notice.
 */
@Component(role = BuildListCalculator.class)
public class BuildListCalculator {
  public ProjectBuildList calculateProjectBuilds(MavenSession session, List<TaskSegment> taskSegments) {
    List<ProjectSegment> projectBuilds = new ArrayList<ProjectSegment>();

    MavenProject rootProject = session.getTopLevelProject();

    for (TaskSegment taskSegment : taskSegments) {
      List<MavenProject> projects;

      if (taskSegment.isAggregating()) {
        projects = Collections.singletonList(rootProject);
      } else {
        projects = session.getProjects();
      }
      for (MavenProject project : projects) {
        BuilderCommon.attachToThread(project); // Not totally sure if this is needed for anything
        MavenSession copiedSession = session.clone();
        copiedSession.setCurrentProject(project);
        projectBuilds.add(new ProjectSegment(project, taskSegment, copiedSession));
      }
    }
    return new ProjectBuildList(projectBuilds);
  }
}
